2 Why should I use Safety Relays?...to meet existing safety standards!...to supervise safety devices! A fault in the hardware or the software of the control system must not lead to hazardous situations. This is the requirement in the EU s Machinery Directive 2006/42/EG under the heading Safety and reliability of control systems. The directive implies that no person should be put at risk if for example, a relay sticks or if a transistor or two electrical conductors short-circuit. A safety relay will fulfill these requirements. A safety relay has, for example, inputs that are checked for short-circuits and dual redundant circuits that are checked at each operation. This can be compared to the dual brake circuits in a car. If one of the circuits is faulty the other will stop the car. In a safety relay there is an additional function which only allows a machine to start if both circuits are ok. The safety standard describes various safety categories depending on the level of risk and application. One single universal relay with selectable safety categories solves this. Light Beams Safety Interlock Switches Light Curtains Emergency Stop Buttons 3-Position Devices Safety Strips and Bumpers 2-Hand Devices Safety Guard Mats...for safe stops and reliable restarts! Dual stop signals when the gate is opened... Entering or putting a hand or limb into a hazardous area, must cause all machines that can cause a personal injury to stop safely. Many serious accidents occur when machinery is believed to have stopped but is in fact only pausing in its program sequence. The safety relay monitors the gate interlock switch, the cables and gives dual stop signals. Supervised reset when there can be a person within the risk area... Make sure that nobody is within the restricted area when activating the reset button. A supervised reset button must be pressed and released before a reset can occur. Many serious accidents have been caused by an unintentional and unsupervised reset. Timed reset when you cannot see the entire risk area... Sometimes a double reset function is necessary to make sure that no one is left behind in the risk area. First, after ensuring no other person is inside the hazardous area, the pre-reset button must be activated, followed by the reset button outside the risk area within an acceptable time period e.g. 10 seconds. A safety timer and a safety relay can provide this function. Automatic reset for small hatches... Where body entry is not possible through a hatch, the safety circuit can be automatically reset. The safety relays are reset immediately when the hatch interlock switch contacts are closed. 5:2

3 The Smallest and Most Flexible Safety Relays on the Market! We have the most flexible safety relays on the market. Our first universal relay was developed nearly 20 years ago. Today the flexibility is even greater and the size has been reduced by 85%. A universal relay is a safety relay with various input options for various safety devices and risk levels. Internally, the safety relay is of the highest safety level (category 4 according to EN 954-1/EN ISO ). A machine supplier can therefore, with one single safety relay, select the input configuration that best suits his customer s safety requirements. In addition, our safety relays have detachable connector blocks for ease of replacement and testing. As our universal relay incorporates all input options, it is compatible with all our previous safety relays as well as with other manufacturers products. Is a universal relay expensive? No, our latest patented construction is extremely simple and the number of major components is less compared to our previous universal relays. This means that our safety relays are even more reliable and economical than before. We also have gained a great deal of experience from creating safety solutions for our own systems. It would be our pleasure to share these experiences with you! Please do not hesitate to contact us if you should require any other safety solutions. Inputs for various safety devices Input for manual or automatic resetting RT7: The most flexible Safety Relay on the market! Detachable connector blocks Outputs for program stop, gate opened or closed and reset indication Safety outputs for immediate and delayed stops at optional times Some of the advantages with JOKAB SAFETY s Safety Relays... Universal relays Excellent reliability Approved in Europe, USA, Canada Supervised reset Time reset Small and compact Detachable connector blocks Low power consumption Permits the use of long runs of cables Functions set by external hardwired links LED indication and outputs for indication Powerful switching capacity 5:3

4 Creating a Control Reliable Safety System Where required by the appropriate ANSI standard (example clause of RIA ), the importance of using safety relays to achieve control reliable circuits can be explained. Control Reliable Systems must be designed such that a single component failure within the system does not prevent the stopping action from taking place but will prevent successive system cycle until that failure has been corrected. Ladder Diagram of a Common Emergency Stop Circuit In this typical emergency stop circuit the weakest link is relay CR1. The contacts of CR1 can weld closed or, since this relay is spring applied, it can fail mechanically. If this failure occurred, energy to the load would continue resulting in an UNSAFE CONDITION that would cause machine damage and/or personnel injury. ANSI standards and OSHA regulations demand prevention of such a condition. Ladder Diagram using two Force-Guided Relays to Achieve Redundancy According to the definition of control reliability we need to guard against failure of CR1. It is one source for a single component failure. Redundancy is not sufficient. If one of the two relays fail you are back to square one with redundancy lost, the second relay could fail on a subsequent machine cycle. We must monitor the condition of the redundant relays. Force or positive guided relays provide the best solution to accomplish monitoring. Ladder Diagram of a Circuit using three Force-Guided Relays This circuit is approaching control reliable. Using positive guided relays offers redundancy and crossmonitoring, but does not monitor for short circuits or reset problems. Note: Safety Category only refers to the safety relay configuration, input devices, output devices and wiring must be considered for a safety category of the system. 5:4

5 Ladder Diagram using three Force-Guided Relays Advantages Has redundancy and cross-monitoring Disadvantages (in comparison to the Jokab Safety Relay) No safety approvals 38 wiring points High chance of wiring errors Installation is labor intensive More costly Larger in overall size (panel space) Easy to tamper with and bypass connections No short circuit protection on the inputs Reset is not monitored Difficult to troubleshoot The more contacts needed, the more complicated the circuit. Note: Safety Category only refers to the safety relay configuration, input devices, output devices and wiring must be considered for a safety category of the system. Wiring Diagram using a RT6 Jokab Safety Relay connected in Input Configuration Mode 4 to Achieve Control Reliability Electrically Advantages (in comparison to the 3 Force-Guided Relays Circuit) Control reliable electrically Has redundancy and cross-monitoring 4 input configuration modes which are hardwire selectable (selectable category of safety) 2 reset configuration modes which are hardwire selectable Manual supervised reset mode monitors the button and wiring against failure Input configuration modes 3 and 4 monitor all input devices and wiring against failure Monitors external positive or force-guided contactors/relays Universal (multi-purpose) Retrofits easily into existing systems 5 LED indicators: Power On, Input 1, Input 2, Output K1 and Output K2 3 NO safety outputs, 1 NC monitoring output 2 transistor outputs for input status and output status Available in a variety of source voltages Terminal strips are removable for easy change 17 wiring points Cost effective Compact in size (45 mm in width) Several safety approvals 5:5

6 Safety Relays Summary Which Safety Relay should you choose? First of all, we recommend the selection of one of our latest universal relays in the RT-series. These are both practical and cost effective. To facilitate the choice of safety relay or combinations of safety relays, please see: the table below dividing the safety relays into application fields the table on the opposite page showing possible input and output options the relevant data sheet giving comprehensive information about each specific safety relay the circuit diagram for various applications are located in "Connection Examples " beginning on page 5:44 Note: All earlier type of relays that can now be replaced by those in this manual are still kept as stock items and can be supplied upon request. Application Fields Safety Safety Expansion Relays Timers Relays RT6 RT7 RT9 JSBRT11 JSBR4 JSBT4 JSBT5T/BT50T/BT51T JSBT5/BT50/BT51 JSHT1A/B JSHT2A/B/C E1T JSR1T JSR2A JSR3T Interlocking Switch/Gate/Hatch Light Curtains Light Beams Safety Mats Contact Strips Two-Hand Control Device Emergency Stop Hold to Run/Enabling Device Foot Control Device Area Supervision Time Resetting Time Bypassing Inching Output Expansion Delayed Output Input Alternatives Single-Channel, 1 NO from +24V Safety Category 1 The input must be closed before the outputs can be activated. A stop signal is given when the input is opened. Two-channel, 2 NO from +24V Safety Category 3 Both the inputs must be closed before the outputs can be activated. A stop signal is given if one or both of the inputs are opened. Both the inputs must be opened and reclosed before the outputs can be reactivated. A shortcircuit between the inputs is not monitored by the safety relay. Category 4 can only be achieved if a safety device with short circuit monitored outputs is connected. Two-Channel, 1 NO & 1 NC from +24 V Safety Category 4 One input must be closed and one must be opened before the outputs can be activated. A stop signal is given if one or both of the inputs change position or if the inputs short-circuit. Both inputs must be put into their initial position before the outputs can be reactivated. Two-Channel, 1 NO from 0 V & 1 NO from +24 V Safety Category 4 Both the inputs must be closed before the outputs can be activated. A stop signal is given if one or both of the inputs are opened. Both the inputs must be opened and reclosed before the outputs can be reactivated. Stop signal is given if there is a short-circuit between the inputs. 5:6

7 Technical Data Safety Safety Expansion * indicates the possibility of selecting delayed outputs indicates one relay contact per output (other relays having two contacts per output) delayed º category 4 depending on connection (when used as expansion relay with Pluto Safety PLC, then category 4) fixed 0.5 s delay RT6 Relays RT7 RT9 JSBRT11 JSBR4 JSBT4 JSBT5T BT50T BT51T BT50 BT51 Timers Relays JSHT1A/B JSHT2A/B/C E1T JSR1T JSR2A JSR3T Safety Category º 1-4º 1-4º 1-4º 1-4º Safety Input Single-Channel, 1 NO from +24 V Two-Channel, 2 NO from +24 V Two-Channel, 1 NO & 1 NC from +24 V Two-Channel, 1 NO from 0 V & 1 NO from + 24 V Contact Strips/Safety Mats Reset & Test Input Monitored Manual Automatic/Unmonitored Manual Testing of Contactors, Relays, Valves, etc. Output NO * 4* 4 NO Delayed * 4* 2 NO Impulse Outputs 2 2 NC * 1 NC Delayed 1 1 1* Information Output Switching Capacity (Resistive Load) 6A/250VAC/1500VA/150W A/250VAC/1000VA/100W A/250VAC/1380VA/138W 2 10A/250VAC/1840VA/192W 5 Width (mm) Supply Voltage 12VDC 24VDC 24VAC 48VAC 115VAC 230VAC Contact strips/ Safety Mats Category 3, up to PL d For an unpressurized mat/strip, both the relay inputs must be closed for the outputs to be activated. In the case of an activated mat/strip and short-circuit input channels, the relay will be de-energized. Current limitation prevents the safety relay from being overloaded when the channels short-circuit. Monitored Manual Reset A monitored reset means that the safety relay will not be reset if the reset button gets jammed when pressed in or if the input shortcircuits. In order for the resetting to be complete, the input must be closed and opened before the outputs can close. Automatic/ Unmonitored Manual Reset Automatic reset means that the outputs are closed immediately when both the input conditions are satisfied and the test input is closed. Testing of Contactors, Relays and Valves Can be carried out with both automatic and manual reset. Note: If serial contacts are connected to the input, the Safety Category is made lower for two-channel connections. Safety Category only refers to the safety relay configuration. Input devices, output devices and wiring must be considered for a safety category of the system. 5:7

8 RT6 Safety Relay Would you like a single safety relay for all your safety applications? Then choose the RT6 universal relay to supervise both your safety devices and the internal safety of your machinery. In addition you can select the safety level required for each installation. All this is possible because the RT6 has the most versatile input option arrangement available on the market. Many other relays can therefore be replaced by the RT6. The relay also comes with other options such as manual or automatic reset. Manual supervised reset can be used for gates and other safety devices that can be passed through. Automatic reset can be used for small hatches, if deemed acceptable from a risk assessment. The RT6 also has information outputs that follow the inputs and outputs of the relay. These outputs will for example indicate if a gate is open or closed and if the safety relay needs to be reset. The RT6 is designed with a minimum amount of components thus keeping both production costs and component acquisitions to a minimum. Choose the RT6 to simplify your safety circuits and reduce your costs. Connection Examples For examples of how our safety relays can solve various safety problems, see Connection Examples beginning on page 5:44. Applications Emergency Stops Light Curtains Three Position Devices Interlocked Gates/Hatches Magnetic Switches Light Beams Safety Mats Contact Strips Foot-Operated Switches Features Five input options Single or dual channel input Manual supervised or automatic reset Test input for supervision of external contactors Width 45 mm LED indication of supply, inputs, outputs, short-circuit and low voltage level 3 NO/1 NC relay outputs Two voltage free transistor information outputs 24 VDC 24, 48, 115 or 230 VAC Quick release connector blocks Approvals TÜV Nord 5:8

9 RT6 Technical Information Inputs The RT6 can be configured to operate in either of the following input options: 1. Single channel, 1 NO contact from +24 V DC, safety category Dual channel, 2 NO contacts from +24 V DC, safety category Dual channel 1 NO, 1 NC contact from +24 V DC, safety category Dual channel, 1 NO contact from 0V and 1 NO contact from +24 V DC, safety category Safety mats/contact strips 1 contact from 0V and 1 contact from +24 V DC, safety category 1. Note: Safety category only refers to the safety relay configuration, input devices, output devices and wiring must be considered for a safety category of the system. When the input/inputs are activated and the test/supervised reset is complete, relays 1 and 2 are energized. These are de-energized when the input/inputs are de-activated in accordance with the input option chosen or in case of a power failure. Relays 1 and 2 must both be de-energized before the RT6 can be reset. Transistor Output Status Information The RT6 has two voltage free transistor outputs that can be connected to a PLC, computer or other monitoring device. These outputs give the input and output status of the relay. Reset and Testing The RT6 has two reset options; manual and automatic. The manual supervised reset is used when the RT6 is monitoring safety devices that can be passed through, i.e. to ensure that the outputs of the safety relay do not close just because a gate is closed. The automatic reset should only be used if deemed an acceptable risk. In addition, the RT6 can also test (supervise), if for example, contactors and valves etc. are de-energized/ de-activated before a restart is allowed. Indication of Low Voltage The On LED will flash if the relay supply voltage falls below an acceptable level. This indication will also be given if a monitored safety mat/contact strip is actuated. See connection option 5. Safety Level The RT6 has internal dual and supervised safety functions. Power failure, internal faulty component or external interference will not present a risk to options with the highest safety level. A manual reset requires that the reset input is closed and opened before the safety relay outputs are activated. A short-circuit or a faulty reset button is consequently supervised. When the RT6 is configured for dual channel input, both the inputs are supervised for correct sequence operation before the unit can be reset. The input options 3 and 4 have the highest safety levels as all short-circuits and power failures are supervised. This in combination with double internal current limitation makes the relay ideal for supervision of safety mats and contact strips. Regulations and Standards The RT6 is designed and approved in accordance with appropriate directives and standards. Examples of such are: 98/37/EC, EN ISO /-2, EN and EN 954-1/EN ISO Connection Examples For examples of how our safety relays can solve various safety problems, see Connection Examples beginning on page 5:44. **Only for AC supply Connection of Supply DC Supply AC Supply DC Supply of AC Units The RT6 DC option should be supplied with +24 V on A1 and 0 V on A2. The RT6 AC option should be supplied with the appropriate supply voltage via connections A1 and A2. The S23/ must be connected to protective earth. All AC-units can also be supplied by +24 VDC to S53 (0VDC to S23). Note: With both DC and AC modules, if cable shielding is used this must be connected to an earth rail or an equivalent earth point. 5:9

10 RT6 Connection of Safety Devices 1. Single Channel, 1 NO from +24V 3. Dual Channel, 1 NO, 1 NC from +24V 5. Safety Mat or Contact Strip The input (contact to S14) must be closed before the outputs can be activated. When the input contact is opened the relay safety output contacts open. 2. Dual Channel, 2 NO from +24V Both input contacts (S14 and S34) must be closed before the relay outputs can be activated. The safety relay contacts will open if one or both of the input contacts are opened. Both the input contacts must be opened and reclosed before the relay can be reset. A short-circuit between inputs S14 and S34 can only be supervised if the device connected to the inputs has short-circuit supervised outputs, e.g. Jokab Focus light curtains. RT6 Reset Connections Manual Supervised Reset The manual supervised reset contact connected to input X1 must be closed and opened in order to activate the relay outputs. RT6 Output Connections Relay Outputs The RT6 has three (3 NO) safety outputs and 1 NC information output. In order to protect the RT6 output contacts it is recommended that loads (inductive) are suppressed by fitting correctly chosen VDRs, diodes, etc. Diodes are the best arc suppressors, but will increase the switch off time of the load. One input contact must be closed (S14) and one opened (S44) before the relay outputs can be activated. The safety relay contacts will open if one or both of the inputs change status or in case of a shortcircuit between S14 and S44. Both inputs must return to their initial positions before the relay outputs can be reactivated. 4. Dual Channel, 1 NO from +24V, 1 NO to 0V Relay functions as option 2, but a shortcircuit, in this case between inputs S14 and S24, is supervised (safety outputs are opened). Automatic Reset Automatic reset * is selected when S53, X1 and X4 are linked. The relay outputs are then activated at the same time as the inputs. *connected to S13 for safety mat/contact strip Transistor Outputs The RT6 has two (2) voltage free transistor information outputs. The transistor outputs are supplied with voltage to Y13, either from S53 (+24V) or an external 5-30 VDC. Y14 and Y24 follow the relay inputs and outputs as follows: Y14 becomes conductive when the relay input conditions are fulfilled. Y24 becomes conductive when both the output relays are activated. ***Note: These outputs are only for information purposes and must not be connected to the safety circuits of the machinery. Both contact inputs from a inactivated safety mat/contact strip must be made in order to allow the RT6 relay outputs to be activated. When the safety mat/contact strip is activated or a short-circuit is detected across S14-S23, the relay will de-energize (safety outputs open) and the ON LED will flash. As output S13 has an internal current limit of 80 ma, the RT6 will not be overloaded when the mat/contact strip is activated or a short circuit is detected. Testing External Contactor Status Contactors, relays and valves can be supervised by connecting test contacts between S53 and X1. Both manual supervised and automatic reset can be used. 5:10

12 RT7 Safety Relay Universal Relay with Delayed Stop Outputs The RT7 is a universal relay that can be used to supervise both safety devices and the internal safety of your machinery. In addition, you can select the safety level that is required for each installation. All this is possible because the RT7 has the most versatile input options arrangement available on the market. The RT7 can therefore replace many other relays. The RT7 has four (4 NO) dual safety outputs of which two may be delayed for up to three seconds in order to achieve a safe and soft stop. A soft stop allows machinery to brake and stop gently before power is removed. A soft stop has many benefits: The machinery life will be prolonged, processed products will not be damaged, and restarts from the stopped position are made possible and easier. Another option with the RT7 is manual or automatic resetting. A manual supervised reset is used for gates and other safety devices that can be passed through, while an automatic reset is used for small safety hatches if deemed appropriate from a risk point of view. In addition, the RT7 has information outputs that follow the inputs and outputs of the relay. These outputs indicate if for example a gate is opened or closed, if there is a delay or if the relay needs to be reset. Choose the RT7 to simplify your safety circuits and reduce your costs. Connection Examples For examples of how our safety relays can solve various safety problems, see Connection Examples beginning on page 5:44. Applications Emergency Stops Light Curtains Three Position Devices Interlocked Gates/Hatches Magnetic Switches Light Beams Safety Mats Contact Strips Foot-Operated Switches Features Five input options Single or dual channel input Manual supervised or automatic reset Test input for supervision of external contactors Width 45 mm LED indication of supply, inputs, outputs, short-circuit and low voltage level 4 NO/1 NC relay outputs, 2 NO outputs can be delayed for soft stops Delay times: RT7A 0; 0.5; 1.0; 1.5 s RT7B 0; 1.0; 2.0; 3.0 s Three voltage free transistor information outputs 24 VDC 24, 48, 115 or 230 VAC Quick release connector blocks Approvals TÜV Nord 5:12

13 RT7 A/B Technical Information Inputs The RT7 can be configured to operate in either of the following input options: 1. Single channel, 1 NO contact from +24 VDC, safety category Dual channel, 2 NO contacts from +24 VDC, safety category Dual channel 1 NO, 1 NC contact from +24 VDC, safety category Dual channel, 1 NO contact from 0V and 1 NO contact from +24 VDC, safety category Safety mats/contact strips 1 contact from 0V and 1 contact from +24 VDC, safety category 1. Note: Safety category only refers to the safety relay configuration, input devices, output devices and wiring must be considered for a safety category of the system. When the input/inputs are activated and the test/supervised reset is complete, relays 1,2,3 and 4 are activated. Relays 1 and 2 are immediately de-energized when the inputs are deactivated in accordance with the input option selected. Relays 3 and 4 are either de-energized imme diately or after the selected time delay. All the relays (1,2,3 and 4) must be de-energized before the RT7 can be reset. Transistor Output Status Information The RT7 has three voltage free transistor outputs that can be connected to a PLC, computer or other monitoring device. These outputs give the input and output status of the relay. Reset and Testing The RT7 has two reset options; manual and automatic. The manual supervised reset is used when the RT7 is monitoring safety devices that can be passed through, i.e. to ensure that the outputs of the safety relay do not close just because the gate is closed. The automatic reset should only be used if deemed an acceptable risk. In addition, the RT7 can also test (supervise), if for example, contactors and valves etc. are de-energized/ de-activated before a restart is allowed. Indication of Low Voltage The On LED will flash if the relay supply voltage falls below an acceptable level. This indication will also be given if a monitored safety mat/contact strip is actuated. See connection option 5. Safety Level The RT7 has internal dual and supervised safety functions. Power failure, internal faulty component or external interference will not present a risk to options with the highest safety level. A manual reset requires that the reset input is closed and opened before the safety relay outputs are activated. A short-circuit or a faulty reset button is consequently supervised. When the RT7 is configured for dual channel input, both the inputs are supervised for correct sequence operation before the unit can be reset. The input options 3 and 4 have the highest safety levels as all short-circuits and power failures are supervised. This in combination with double internal current limitation makes the relay ideal for supervision of safety mats and contact strips. Regulations and Standards The RT7 is designed and approved in accordance with appropriate directives and standards. Examples of such are: 98/37/EC, EN ISO /-2, EN and EN 954-1/EN ISO Connection Examples For examples of how our safety relays can solve various safety problems, see Connection Examples beginning on page 5:44. **Only for AC supply Connection of Supply DC Supply AC Supply DC Supply of AC Units The RT7 DC option should be supplied with +24 V on A1 and 0 V on A2. The RT7 AC option should be sup plied with the appropriate supply voltage via connections A1 and A2. The S23/ must be connected to protective earth. All AC-units can also be supplied by +24 VDC to S53 (0VDC to S23). Note: With both DC and AC modules, if cable shielding is used this must be connected to an earth rail or an equivalent earth point. 5:13

14 RT7 A/B Connection of Safety Devices 1. Single Channel, 1 NO from +24V 3. Dual Channel, 1 NO, 1 NC from +24V 5. Safety Mat or Contact Strip The input (contact to S14) must be closed before the outputs can be activated. When the input contact is opened the relay safety output contacts open. 2. Dual Channel, 2 NO from +24V Both input contacts (S14 and S34) must be closed before the relay outputs can be activated. The safety relay contacts will open if one or both of the input contacts are opened. Both the input contacts must be opened and reclosed before the relay can be reset. A short-circuit between inputs S14 and S34 can only be supervised if the device connected to the inputs has short-circuit supervised outputs, e.g. Jokab Focus light curtains. One input contact must be closed (S14) and one opened (S44) before the relay outputs can be activated. The safety relay contacts will open if one or both of the inputs change status or in case of a shortcircuit between S14 and S44. Both inputs must return to their initial positions before the relay outputs can be reactivated. 4. Dual Channel, 1 NO from +24V, 1 NO to 0V Relay functions as option 2, but a shortcircuit, in this case between inputs S14 and S24, is supervised (safety outputs are opened). Both contact inputs from a inactivated safety mat/contact strip must be made in order to allow the RT7 relay outputs to be activated. When the safety mat/contact strip is activated or a short-circuit is detected across S14-S23, the relay will de-energize (safety outputs open) and the ON LED will flash. As output S13 has an internal current limit of 60 ma, the RT7 will not be overloaded when the mat/contact strip is activated or a short circuit is detected. RT7 A/B Reset Connections Manual Supervised Reset The manual supervised reset contact connected to input X1 must be closed and opened in order to activate the relay outputs. RT7 A/B Output Connections Relay Outputs The RT7 has four (4 NO) safety outputs, of which two can be delayed, and 1 NC information output. In order to protect the RT7 output contacts it is recommended that loads (inductive) are suppressed by fitting correctly chosen VDRs, diodes, etc. Diodes are the best arc suppressors, but will increase the switch off time of the load. Automatic Reset Automatic reset is selected when S53, X1 and X4 are linked. The relay outputs are then activated at the same time as the * inputs. *connected to S13 for safety mat/contact strip Transistor Outputs The RT7 has three (3) voltage free transistor information outputs. The transistor outputs are supplied with voltage to Y13, either from S53 (+24V) or an external 5-30 VDC. Y14, Y24 and Y34 follow the relay inputs and outputs as follows: Y14 becomes conductive when the relay input conditions are fulfilled. Y24 becomes conductive when both the output relays are activated. Y34 becomes conductive when both the delay output relays are activated. ***Note: These outputs are only for information purposes and must not be connected to the safety circuits of the machinery. Testing External Contactor Status Contactors, relays and valves can be supervised by connecting test contacts between S53 and X1. Both manual supervised and automatic reset can be used. Time Delay Outputs Time delays are selected by linking the appropriate T0, T1 and T2 connections. When a stop signal is detected a program stop command is first given to the PLC/servo which brakes the dangerous machine operations in a soft and controlled way. The delayed relay safety outputs will then turn off the power to the motors, i.e. when the machinery has already stopped. It takes usually around 0.5 to 3 seconds for a dangerous action to be stopped softly. 5:14

16 RT9 Safety Relay Would you like a small safety relay for all your safety applications? If so, then choose the compact RT9 universal relay to supervise both your safety devices and the internal safety of your machinery. In addition, you can select the safety level that is required for each installation. All this is possible due to the RT9 offering the most versatile input option arrangement available on the market. The RT9 can therefore replace many other relays. Other RT9 options include selection of either manual supervised or automatic resetting. The manual supervised reset can be used for gates and other safety devices that can be passed through. Automatic reset can be used for small safety hatches, if deemed acceptable from risk assessment. In addition, the RT9 has a dual function information output that will indicate, e.g. if a gate is open or if the relay needs resetting. The RT9 uses the latest component technology and modern assembly techniques to ensure a highly cost effective solution. Choose the RT9 to simplify your safety circuits and reduce your costs. Connection Examples For examples of how our safety relays can solve various safety problems, see Connection Examples beginning on page 5:44. Applications Emergency Stops Light Curtains Three Position Devices Interlocked Gates/Hatches Magnetic Switches Light Beams Safety Mats Contact Strips Foot-Operated Switches Features Five input options Single or dual channel input Manual supervised or automatic reset Test input for supervision of external contactors Width 22.5 mm LED indication of supply, inputs, outputs, short-circuit and low voltage level 2 NO relay outputs 1 changeover relay with a dual information output 24 VDC Detachable connection blocks Approvals TÜV Nord 5:16

17 RT9 Technical Information Inputs The RT9 can be configured to operate in either of the following input options: 1. Single channel, 1 NO contact from +24 VDC, safety category Dual channel, 2 NO contacts from +24 VDC, safety category Dual channel, 1 NO, 1 NC contact from +24 VDC, safety category Dual channel, 1 NO contact from 0V and 1 NO contact from +24 VDC, safety category Safety mats/contact strips 1 contact from 0V and 1 contact from +24 VDC, safety category 1. Note: Safety category only refers to the safety relay configuration, input devices, output devices and wiring must be considered for a safety category of the system. When the input/inputs are activated and the test/supervised reset is complete, relays 1 and 2 are energized. These are de-energized when the input/ inputs are de-activated in accordance with the input option chosen or in case of a power failure. Relays 1 and 2 must both be de-energized before the RT9 can be reset. Transistor Output Status Information The RT9 has a changeover contact relay output that can be connected to a PLC, control lamp, computer or similar. The output gives information about the status of the relay. Reset and Testing The RT9 has two reset options; manual and automatic. The manual supervised reset is used when the RT9 is monitoring safety devices that can be passed through, i.e. to ensure that the outputs of the safety relay do not close just because a gate is closed. The automatic reset should only be used if deemed an acceptable risk. Due to special internal circuits the RT9 can be automatically reset regardless of the operational voltage rise time, this being an important factor when large loads are started up on the same power supplies at the same time. In addition, the RT9 can also test (supervise), if for example, contactors and valves, etc. are de-energized/ de-activated before a restart is made. Indication of Low Voltage The On LED will flash if the relay supply voltage falls below an acceptable level. This indication will also be given if a monitored safety mat/contact strip is actuated. Safety Level The RT9 has internal dual and supervised safety functions. Power failure, internal faulty component or external interference will not present a risk to options with the highest safety level. A manual reset requires that the reset input is closed and opened before the safety relay outputs are activated. A short-circuit or a faulty reset button is consequently supervised. When the RT9 is configured for dual channel input, both the inputs are supervised for correct operation before the unit can be reset. The input options 3 and 4 have the highest safety levels as all short-circuits and power failures are supervised. This in combination with double internal current limitation makes the relay ideal for supervision of safety mats and contact strips. Regulations and Standards The RT9 is designed and approved in accordance with appropriate directives and standards. Examples of such are: 98/37/EC, EN ISO /-2, EN and EN 954-1/EN ISO Connection Examples For examples of how our safety relays can solve various safety problems, see Connection Examples beginning on page 5:44. Connection of Supply DC Supply Y14 The RT9 should be supplied with +24 V on A1 and 0 V on A2. Note: If cable shielding is used this must be connected to an earth rail or an equivalent earth point. 5:17

18 RT9 Connection of Safety Devices 1. Single Channel, 1 NO from +24V 3. Dual Channel, 1 NO, 1 NC from +24V 5. Safety Mat or Contact Strip The input (contact to S14) must be closed before the outputs can be activated. When the input contact is opened the relay safety output contacts open. 2. Dual Channel, 2 NO from +24V Both input contacts (S14 and S34) must be closed before the relay outputs can be activated. The safety relay contacts will open if one or both of the input contacts are opened. Both the input contacts must be opened and reclosed before the relay can be reset. A short-circuit between inputs S14 and S34 can only be supervised if the device connected to the inputs has short-circuit supervised outputs, e.g. Jokab Focus light curtains. RT9 Reset Connections Manual Supervised Reset The manual supervised reset contact connected to input X1 must be closed and opened in order to activate the relay outputs. RT9 Output Connections Relay Outputs The RT9 has two (2 NO) safety outputs. In order to protect the RT9 output contacts it is recommended that loads (inductive) are suppressed by fitting correctly chosen VDRs, diodes, etc. Diodes are the best arc suppressors, but will increase the switch off time of the load. One input contact must be closed (S14) and one opened (S44) before the relay outputs can be activated. The safety relay contacts will open if one or both of the inputs change status or in case of a shortcircuit between S14 and S44. Both inputs must return to their initial positions before the relay outputs can be reactivated. 4. Dual Channel, 1 NO from +24V, 1 NO to 0V Relay functions as option 2, but a shortcircuit, in this case between inputs S14 and S24, is supervised (safety outputs are opened). Automatic Reset Automatic reset is selected when A1(+), X1 and X4 are linked. The relay outputs are then activated at the same time as the * inputs. Transistor Outputs The RT9 has a changeover contact information output. The relay output Y14 is connected internally to 0V and 24V in the following way: Y14 is internally closed to 0V when the RT9 is not reset. Y14 is internally closed to +24V when the RT9 is reset. Both contact inputs from a inactivated safety mat/contact strip must be made in order to allow the RT9 relay outputs to be activated. When the safety mat/contact strip is activated or a short-circuit is detected across S14-S23, the relay will de-energize (safety outputs open) and the ON LED will flash. As output S13 has an internal current limit of 85 ma, the RT9 will not be overloaded when the mat/contact strip is activated or a short circuit is detected. Testing External Contactor Status Contactors, relays and valves can be supervised by connecting test contacts between A1(+) and X1. Both manual supervised and automatic reset can be used. 5:18

20 JSBRT11 Safety Relay Flexible Safety Relay with Various Outputs The JSBRT11 has been designed to provide the safety system circuit designer with the ability to select from both a range of input connection configurations and either automatic or supervised reset. The unit can be hardwire configured to operate in either of the following input configurations: Mode 1: Single Channel (1 NO contact from +24 VDC), safety category 1 Mode 2: Dual Channel (2 NO contacts from +24 VDC), safety category 3 Mode 3: Dual Channel (1NO, 1 NC contacts from +24 VDC), safety category 4 Mode 5: Dual Channel (1 NO) contact from 0 V and 1 NO contact from +24 VDC), safety category 4 In addition, the unit can also be used to test that contactors and valves have fallen/returned to their reset state before a new start signal is given. Safety Level The JSBRT11 has dual and monitored internal safety functions. Power failure, internal component failures or external interference (with the exception of short circuiting of input contact when used in a single channel input mode) do not result in a dangerous function. When wired for supervised reset, should a short circuit appear across the reset input the relay will not automatically reset when the input/inputs are made. Only when the supervised reset input is made and broken will the relay reset. The JSBRT11 provides detection of contact failure in the inputs when wired in dual channel mode. Both inputs have to be opened and closed in order to enable the reactivation of the relay. The highest safety level of the JSBRT11 is in configuration mode 3 or 4 because all short circuits are supervised, i.e. a short circuit between the inputs leads to a safe state as the outputs drop out. Connection Examples For examples of how our safety relays can solve various safety problems, see Connection Examples beginning on page 5:44. Applications Emergency Stops Light Curtains Three Position Devices Interlocked Gates/Hatches Magnetic Switches Light Beams Foot-Operated Switches Features Selectable inputs and safety category Manual supervised or automatic reset Width 100 mm LED indication of supply, inputs and outputs 7 NO + 2 NC relay outputs Supply 24 VDC 24, 48, 115 or 230 VAC Quick release connector blocks Regulations and Standards The JSBRT11 is designed and approved in accordance with appropriate directives and standards. See Technical Data. Approvals TÜV Nord 5:20

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